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S A I I n t e r n a t i o n a l S c h o o
SAI International Schooll
Class VII
Lesson Notes

Subject: Physics
C
Chh-Heat and Temperature
Subtopic: Thermometer

Thermometer:
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T The devices that are used to measure temperature are called thermometer.

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The devices that are used to measure temperature are called thermometer.
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There are three types of thermometer:
T h e r e a r e t h r e e t yp e s o f t h e r m o m e t e r :
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 Clinical thermometer
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L
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 Laboratory thermometerr
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 Digital thermometer

Clinical thermometer:
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T The thermometer which is used to measure human body temperature is known as
The thermometer which is used to measure human body temperature is known as
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Clinical thermometer.
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 The range of clinical thermometer is 355 C to 42 C or 94 F to 108 F.
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T
C or 94

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 Clinical thermometer has a slight bent just above the mercury bulb
r rmometer has a slight bent just above the mercury bulb
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which is known as Kinkto prevent the immediate backflow of
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w which is known as Kinkto prevent the immediate backflow of

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mercury in the mercury tube.
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T The normal human body temperature of healthy person is 37
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 The normal human body temperature of healthy person is 377 C or
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98.6 F
CONSTRUCTION:
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A Clinical thermometer is made up of a long, narrow, cylindrical glass tube which
A C l i n i ca l t h e r m o m e t e r made up of a long, narrow, cylindrical glass tube which
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is sealed at both the ends.
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I Inside the glass tube there is another thin glass tube and at the lower end is a
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Inside the glass tube there is another thin glass tube and at the lower end is a

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bulb which contains mercury.
b u l b w h i ch c o n t a i n s m e r c u r y .

glass tube is called
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There is special feature or constriction in the bottom of the glass tube is called
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kink.

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Precautions should be taken while handling Clinical thermometer such as:

Clinical thermometer
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I It should be washed with antiseptic before and after use.
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1. It should be washed with antiseptic before and after use.
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s should be handled with care.
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2. It is made up of glass, should be handled with care.

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